FUEL
·
2021
·
IF 6.609
Pengfei Cao,Haitao Zhao,Stephen Adegbite,Bolun Yang,Edward Lester,Tao Wu
CO 2 dry reforming of methane (DRM) is one of the most promising routes for the large-scale utilization of greenhouse gases (CO 2 and CH 4 ). However, it is still of challenges to develop catalysts that are efficient and cheap but are of high resistivity in coke formation to maintain long-term stability. Herein, K 2 CO 3 was used as a promoter to enable dynamic coke elimination reaction over the Ni/Al 2 O 3 for CO 2 reforming of CH 4 . K 2 CO 3 -modified Ni/Al 2 O 3 catalysts were synthesized via a wet co-impregnation method and investigated for DRM. The 1.0 K-Ni/Al 2 O 3 exhibited the best stability in the test of 96 h on stream at 800 °C. It was found that coke resistance of K 2 CO 3 modified catalyst was significantly improved, as the coke formation on 1.0 K-Ni/Al 2 O 3 catalyst was only 1/3 of that on Ni/Al 2 O 3 catalyst after a long-term test. Characterization results showed that the growth of Ni particles was suppressed because the addition of K 2 CO 3 enhanced the interaction between Ni and Al 2 O 3 . Meanwhile, the addition of K 2 CO 3 raises the basicity of the catalysts, which enhances the adsorption of CO 2 on the surface and subsequently facilitates CO 2 dry reforming of CH 4 . In addition, the transient experiment reveals that K 2 CO 3 enables a dynamic coke elimination reaction (KCER) via enhancing the catalytic reaction of disordered carbon with CO 2 , which is considered as a promising low-cost approach to stabilize the performance of the Ni-based catalysts in DRM reaction.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Zhenhua Dang,Mingming Jia,Jun Liao,Yong Zhang,Wenkun Zhu
Al 2 O 3 aerogels have been synthesized by in situ water formation method using different agents including phenylenediamine, aniline, thiourea and urea for in-situ water formation. Then, various of techniques were implemented to analyze the structure of these as-prepared Al 2 O 3 aerogels. The results showed that the Al 2 O 3 –Th possessed the uniform porous morphology, which might provide the large specific surface area and a large number of active sites to dislodge U(VI) species. Additionally, the adsorption properties of the as-prepared Al 2 O 3 aerogels to U(VI) from solution were investigated. It could be concluded that the removal of U(VI) on Al 2 O 3 aerogels were independent on ionic strength and strongly reliant on the initial pH. The adsorption isotherms of Al 2 O 3 –Th to U(VI) could be imitated using the Langmuir model and the maximum adsorption capacities in simulated seawater and aqueous solution were 270.9 and 634.0 mg/g, respectively, which showed that the adsorption property of Al 2 O 3 –Th was much better than that of other reported Al 2 O 3 -based adsorbents. In addition, the adsorption efficiency of Al 2 O 3 –Th reached 70% within 5 min and the equilibrium of U(VI) adsorption was achieved within 100 min ( C 0 = 10 mg/L). Meanwhile, the adsorption efficiency of Al 2 O 3 –Th to U(VI) maintained quite good and the value still reached about 93% after five consecutive cycles. These results indicated that the Al 2 O 3 aerogels would be applied as potential materials for wastewater treatment .
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高影响因子
WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 93
·期 8
·1361-1369
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IF 1.946
Shengkai Xu,Jiaxin Yang,Rafaat Hussein,Guangqing Liu,Bensheng Su
In this study, the performance of ofloxacin (OFX) degradation in synthetic wastewater using synthesized MnO x -CeO x /γ-Al 2 O 3 as a heterogeneous ozonation catalyst was evaluated. The removal rates of OFX and chemical oxygen demand (COD) during 15-day continuous-flow experiments were 98.2% and 76.7% on average, respectively. An ozone index (mgCOD/mgO 3 ) of 1.09 with a high ozone utilization efficiency of 91.39% was achieved. The pseudo-first-order rate constant of ofloxacin degradation reached 15.216 × 10 −2 min −1 , which was five times that (3.085 × 10 −2 min −1 ) without catalysts. The results of gas chromatography-mass spectrometry (GC-MS) demonstrated that a variety of small-molecule organics occurred in the final oxidation products, such as 4-hydroxyl-4-methyl-2-pentanone and 2-oxoadipic acid in addition to homologs of OFX. The results of this study suggested that hydroxyl radicals played critical roles in the degradation and mineralization of OFX via four main pathways: (a) electrophilic addition of nitrogen; (b) breakdown of carbon-carbon double bonds; (c) hydrolysis of ether rings; and (d) halodecarboxylation of carboxyl groups. The biodegradability (BOD 5 /COD) of OFX after catalytic ozonation reached 0.54. Practitioner points Ofloxacin wastewater was treated using catalytic ozonation in a 15-day continuous experiment with MnO x -CeO x /γ-Al 2 O 3 as a catalyst. The ozone index reached 1.09 mgCOD/mgO 3 during ozonation of ofloxacin. The presence of the catalyst increased the reaction rate constant by a factor of five. 4-hydroxy-4-methyl-2-pentanone was the primary ofloxacin oxidation product.
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PubMed
高影响因子
Frontiers in Chemistry
·
2020
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IF 3.693
Wang Xinzhi,Jiang Qianqian,Zhang Yichi,Yuan Nannan,Tang Jianguo
PLA-1-Al2O3@LNCM synthesized using an efficient and facile plasma-enhanced method exhibits markedly improved capacity retention of 98.6% after 100 cycles, which is much larger than that of LNCM at 80% after 100 cycles. What is more, it also exhibits significantly enhanced cyclicity compared to that of 1-Al2O3@LNCM cathodes prepared using the normal solid state method, which further illustrates the efficiency and superiority of this plasma-enhanced method. More importantly, the rate performance of PLA-1-Al2O3@LNCM is improved because of the better electrolyte storage of the assembled hierarchical architecture of the Al2O3 coating layer according to unimpeded Li+ diffusion from electrode to electrolyte. When cycling at 55°C, the PLA-1-Al2O3@LNCM shows 93.6% capacity retention after 100 cycles, which is greatly enhanced due to the uniform Al2O3 layer. Further, growth of polarization impedance during cycling can be effectively suppressed by the Al2O3 layer, which can further confirm the effect the Al2O3 layer coated on the surface of the LNCM. The enhanced cycling performance and thermal stability illustrates that this facile surface modification, using the plasma-enhanced method, can form an effective structured coating layer, which indicates its prospects as an application in the modification of other electrode materials.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Zhichao Yang,Weiquan Cai,Jinpeng Zhou,Qing Xia,Tielin Wang
A fast, large-scale, and stable preparation method was successfully developed to obtain η-Al2O3 microspheres with particle sizes of 3–10 μm from cheap and widely sourced NaAlO2 solution using N,N-dimethylformamide (DMF) as a morphological modifier and a precipitant simultaneously at room temperature. The yield of alumina increases from 33.3 to 77.3% by increasing the dose of DMF from 100 to 400 mL. The utilization efficiency of DMF significantly increased by adding fresh NaAlO2 into the reused filtrate after separating the bayerite precipitate (precursor of η-Al2O3). Importantly, the η-Al2O3 microspheres obtained from the filtrate-reuse experiments show the stable phase structures, morphologies, and pore structure properties. Furthermore, the typical η-Al2O3 microspheres supported Pd catalyst presents a higher catalytic activity of 10.6 g/L for the hydrogenation of anthraquinone than that of the commercial γ-Al2O3-supported Pd catalyst (8.5 g/L), suggesting that the as-prepared η-Al2O3 microspheres have good application prospects for catalytic hydrogenation and related fields.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7280-7287
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IF 11.301
Ziyue Wen,Yuejiao Li,Zhikun Zhao,Wenjie Qu,Nan Chen,Yi Xing,Yue Ma,Li Li,Feng Wu,Renjie Chen
Poor interfacial contact and Li dendritic growth severely restrict practical applications of Li metal anodes. Herein, we report a novel biomimetic solid-state electrolyte based on injection of 1 M LiTFSI-Py13TFSI ionic liquid electrolyte into a leaf-like Al2O3 skeleton through an in situ sol–gel method. This structure is intended to address the poor contact at the interface and protect the Li metal anode. A large amount of ionic liquid electrolyte was absorbed by the leaf-like Al2O3 skeleton owing to its high specific surface area. This system improved the ionic conductivity and promoted migration of Li+ both in the bulk and at the interface. The lithiophilic Al2O3 skeleton was in close contact with metallic Li and formed a fast Li+ conductive layer (Li–Al–O composition), which facilitated uniform deposition of Li and thus inhibited Li dendrite formation during long-term cycling. Moreover, density functional theory calculations indicated spontaneous generation of a Li–Al–O layer and [Py13]+ in the ionic liquid facilitates this process. Symmetric Li cells assembled with this electrolyte exhibited an extremely long cycle lifetime of 1100 h at a high constant current density. This strategy of a biomimetic leaf-structured electrolyte with a Li–Al–O conductive layer at the interface addresses problems of solid-state Li metal batteries and provides an alternative system for practical applications.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
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IF 7.094
Qungui Wei,Dan Yang,Liyuan Yu,Yufeng Ni,Liqun Zhang
Owing to excellent adhesion and easy process, dopamine has been widely used as an intermediate for adjusting the molecular structure of nanoparticles . However, the high cost of dopamine largely impedes its large-scale applications. Herein, alumina@poly(catechol-polyamine)@graphene oxide (denoted as Al 2 O 3 @PCPA@GO) multilayer core-shell hybrids were prepared via poly(catechol-polyamine) (PCPA) modification. The as-prepared hybrids were added into the carboxyl nitrile butadiene rubber (XNBR) latex to produce composites with high thermal conductivity because of the strong interaction between polar groups in Al 2 O 3 @PCPA@GO core-shell hybrids and C N groups in XNBR matrix. Finally, the maximum thermal conductivity (0.48 W/mK) was obtained with 30 vol% Al 2 O 3 @PCPA@GO/XNBR composite, which was about three times of pure XNBR matrix (0.16 W/mK). Moreover, 30 vol% Al 2 O 3 @PCPA@GO composite showed a high dielectric constant (16.84 at 100 Hz) and low dielectric loss tangent (0.45 at 100 Hz). Besides, the 30 vol% Al 2 O 3 @PCPA@GO/XNBR composite displayed a high tensile strength of 11.86 MPa, which is an advantage for practical applications. The developed method has a shorter reaction time and lower cost compared with poly(dopamine) coating, suggesting potential applications as thermally conductive materials for electronic equipment.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinjin Ban,Chaojie Zhou,Long Feng,Quanli Jia,Xinhong Liu,Junhua Hu
ZrB 2 -SiCw (w-whisker) composite powders were synthesized by a microwave-assisted carbo/borothermal reduction method under argon atmosphere using zircon , boric acid, and activated carbon as starting materials. The optimized ZrB 2 -SiCw composite powder was obtained by adjusting heating temperature and amounts of boric acid and activated carbon. Further, the effect of the optimized ZrB 2 -SiCw composite powder addition on corrosion resistance of the Al 2 O 3 –ZrO 2 –C slide plate material against O 2 and Ca-treated steel was investigated. The results showed that the relative content of ZrB 2 -SiCw increased with increasing temperature. The excess of boric acid favored the formation of the ZrB 2 -SiCw, and the optimum amount of boric acid was overdosed to 30–45 wt%. The corrosion resistance and thermo-mechanical properties of Al 2 O 3 –ZrO 2 –C slide plate material could be improved effectively with 6 wt% ZrB 2 -SiCw composite powder addition, which was attributed to the excellent oxidation and corrosion resistance of ZrB 2 -SiCw composite powder. In addition, ZrB 2 -SiCw could confer excellent thermal shock resistance and reduce the generation of cracks, ultimately preventing corrosive media from infiltrating into slide plates, further increasing corrosion resistance of the plates.
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ACS Sustainable Chemistry & Engineering
·
2023
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IF 8.4
Zhuoran Wang,Wenjia Li,Zhou Zhang,Lili Jia,Jia Wang
The hydrogenolysis of glucose to 1,2-propylene glycol (1,2-PG) has become a powerful and practical approach to using biomass resources. A series of Pt (2%)/WOx (7.5%) catalysts supported on different kinds of γ-Al2O3 were prepared by stepwise incipient wetness impregnation. The effects of Al2O3 supports on the physicochemical parameters and catalytic capabilities of catalysts used in the hydrogenolysis of glucose to 1,2-PG were investigated. Subsequently, an attempt was made to relate the catalytic activities to the structures of the W species. When Nano-Al2O3 was used as the support, the Pt/WOx/Nano-Al2O3 catalyst demonstrated the best performance, yielding 55.8% 1,2-PG after heating at 245 °C for 1 h. The excellent performance of the Pt/WOx/Nano-Al2O3 catalyst was attributed to the high dispersion of the Pt center and the optimal W species structure on the catalyst surface (monodisperse W species coexisting with the polymerized W species).
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Hang Liu,Shengqiang Song,Pin-Wen Guan,Guixuan Wu,Mithun Nath
Despite great potential in several applications, the pseudo-ternary system Al 2 O 3 –CaO–Cr 2 O x is an overlooked phase diagram due to the formation of a few toxic, carcinogenic, and water-soluble Cr 6+ compounds. In the research paper, equilibrium experimentation of selected compositions was conducted at 1073, 1373, and 1673 K and investigated using XRD , SEM-EDS, and leaching tests. Further, thermodynamic modeling of limited databases of the pseudo-ternary system Al 2 O 3 –CaO–Cr 2 O x was validated using DFT calculations. Including the recently discovered novel phase CaAl 2 Cr 2 O 7 (wuboraite), the seven phases not available in the SGTE SUBstance (SSUB) database, along with the CaCrO 4 and CaCr 2 O 4 phases existing therein, were modeled using Density Functional Theory (DFT). Based on the above experiments and the present CALPHAD model, we have calculated the isothermal sections (1073, 1373, and 1673 K) of the Al 2 O 3 –CaO–Cr 2 O x system for different oxygen partial pressures ( P (O 2 )= 0.21 atm and P (O 2 )= 10 −8 atm).
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaofei Zhai,Jingyi Chen,Yaru Wang,Ruyue Su,Xiong Gao,Xueqin Zhang,Hua Jin,Rujie He
When preparing ceramic materials, high porosity and high strength are often played against each other. How to balance porosity and strength has become a core issue in the 3D printing of ceramic cores. In this work, alumina ceramic cores with a high porosity (36.93%) and a high flexural strength (75.4 MPa) were prepared by combining the vat photopolymerization 3D printing with sacrificial templating. The porosity of alumina ceramic cores was improved by the sacrificial templating method, and the flexural strength was enhanced with alumina particle grading. The effects of pore former (PMMA) content and particle size on the shrinkage, porosity, microstructure, and comprehensive performance of alumina ceramic cores were investigated to reveal the mechanism of simultaneous high porosity and high strength.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Jinkun Liu,Yimeng Luo,Zhun Ran,Fenglin Wang,Minhua Sun,Yangyang Luo,Jianle Zhuang,Xuejie Zhang,Bingfu Lei,Yingliang Liu,Chaofan Hu
The room temperature afterglow (RTA) of carbon dots (CDs) and their wide-ranging application prospects have attracted significant attention. However, most of the synthesis and regulation methods for multicolor CDs-based RTA materials are complex. Therefore, it is still a challenge to obtain a series of CDs-based RTA materials with broad and tunable emission wavelengths via a simple preparation method using the same organic precursor and matrix. In this study, a series of CDs@Al 2 O 3 materials with ultra-broad afterglow emission range (376 ∼ 619 nm) were prepared by regulating the reaction temperature through a one-step calcination method. High-temperature consumption led to a decrease of surface functional groups and conjugation size of CDs, resulting in the gradually blue-shifted emission from red to UV region. We also discovered a unique phenomenon where the afterglow emission mode of the material shifted from room temperature phosphorescence (RTP) to thermally activated delayed fluorescence (TADF) as the temperature increased, attributed to the stabilization of the excited triplet state from the strengthened crystallinity of Al 2 O 3 matrix. Furthermore, a continuous emission at ∼ 471 nm attributed to the oxygen defects of the matrix was observed. Multiple anti-counterfeiting, information encryption, and fingerprint detection are demonstrated based on the unique RTA properties of CDs@Al 2 O 3 .
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危险品化学品经营许可证（带存储）